Mood swings begin when the brain is experiencing low blood sugar. The low blood sugar signals a part of the brain called the pituitary gland to cause the adrenals to secrete one drop of adrenaline.
The adrenaline then makes the heart pump faster to get more blood to the brain which solves part of the blood glucose problem, however, it makes you think and feel like you are under stress. The anger is a natural byproduct of the bodies stress response.
The cure for the problem is to address the brain circulation issue. Improving the flow of blood both into and out of the brain is essential for proper brain function